This question is mainly for the anaesthesiologists. Many of my seniors remove the spinal needle after few seconds of injecting Bupivacaine and they make the patients supine slowly. According to them it gives sufficient levels with less local anesthetic and prolongs the duration.

I have also used this technique for few cases and found it useful. Though they don't have any evidence based journal. Please share your views and if possible  provide me any evidence based article.